swift -自定義返回圖片，替換系統圖片backItem

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隱藏系統返回按鍵

        
方法1：self.navigationItem.leftBarButtonItem = nil //隱藏自定義的itemself.navigationItem.hidesBackButton = true    //隱藏系統的item方法2：let item =  UIBarButtonItem(image: nil, style: UIBarButtonItem.Style.plain, target: nil, action: nil)self.navigationItem.leftBarButtonItems = [item]

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?設置自定義返回按鈕方法：

 /// 設置返回圖片func setNavBackBtn(backType:JYBackBtnTypeEnum){var imageName = ""switch backType {case JYBackBtnTypeEnum.gray:imageName = "back_normal_gray"case JYBackBtnTypeEnum.white:imageName = "back_normal_white"}let item = UIBarButtonItem(image:  UIImage.init(named: imageName)?.withRenderingMode(UIImage.RenderingMode.alwaysOriginal), style: .plain, target: self, action: #selector(clcikBackBtn))self.navigationItem.leftBarButtonItems = [item]}//返回按鈕點擊響應@objc func clcikBackBtn(){self.navigationController?.popViewController(animated: true)}